FacetWP – force-load assets for specific page(s)

<?php

// Load assets on the "about" page (https://yoursite.com/about/)
// Add the following to your (child) theme's functions.php

add_filter( 'facetwp_load_assets', function( $bool ) {
    if ( 'about' == FWP()->helper->get_uri() ) {
        $bool = true;
    }
    return $bool;
});